A New Synthesis of<i>cis</i>-1,6-Diphenyl-2,5,7,10-tetraoxabicyclo[4.4.0]decane and Related Six Membered Cyclic Oxido Compounds
作者:Luigi Lopez、Vincenzo Calò、Francesca Stasi
DOI:10.1055/s-1987-28136
日期:——
The synthesis of cis-tetraoxabicyclo decanes 2 and 7 have been performed by treatment of 2,3-diphenyl-5,6-dihydro-1,4-dioxin (1) or cis-2,3,5,6-tetraphenyl-5,6-dihydro-1,4-dioxin (3) with two equivalents of tris (p-bromophenyl)ammonium tetrafluoroborate in a dichloromethane(ethylene glycol mixture. The structural and conformational assignments have been made on the basis of spectroscopical and single crystal X-ray diffraction data. Similar reaction of 2,3,5, 6-tetraphenyl-p-dioxin (4) with the same one electron oxidizing agent in dichloromethane/alcohol mixtures afford trans-2,3-dialkoxy derivatives 8 and 9.
Synthesis of (Z)-stilbendiol dibenzoate by sensitized photooxygenation of 2,3,5,6-tetraphenyl-p-dioxin
作者:Luigi Lopez
DOI:10.1016/s0040-4039(00)98741-0
日期:1985.1
Sensitizedphotooxygenation of 2,3,5,6-tetraphenyl-p-dioxin with singlet and triplet excitable sensitizers yields (Z)-stilbendiol dibenzoate together with benzil. Experimental proofs show that unconnected mechanisms could operate accounting for the 1,2 -diketone and the endiol diester formation.